Jicheng He's research while affiliated with Northeastern University and other places
What is this page?
This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
Publications (138)
The carbide precipitation nature of an automobile gear material, i.e. Fe-C-Mn-Si-Cr-Mo alloy, during carburization and element addition process are investigated through PE+PA+LR prediction. Results show that, carburization process greatly increases the amount of cementite as well as the hardness index at the surface part. Besides, the addition of T...
The steel-teeming time, which is directly affected by the output parameters of the power supply, is one of the most important technical indicators of an electromagnetic steel-teeming system. Therefore, this work employs numerical simulation to build a power supply output parameter model for the electromagnetic steel-teeming system of a 110 t ladle...
Flow behavior in the slab mold by optimized swirling flow generation in the submerged entry nozzle (SEN) is investigated. Therefore, hydromechanical model experiment was carried out to simulate this metallurgical process, the effect of turning around the nozzle with swirling and different bottom shape of nozzle is especially analyzed. The flow beha...
The effects of Co, Ni together with W addition on the precipitation sequence, amount, and composition of carbides and FCC matrix in Fe–C–V–Cr–Mo based alloys are investigated with the help of Partial Equilibrium (PE) approximation and thermodynamic calculations as well as differential scanning calorimetry (DSC) and electron backscatter diffraction...
Improving the efficiency of electromagnetic steel teeming systems have included methods to accelerate the heating process, wherein the most convenient and effective is to adjust the position of the blocking layer. Herein, numerical simulation is used to initially optimize the physical parameters (material type, shape and particle size) of the Fe-C...
For further lowering inclusions and improving the quality of steel, a new electromagnetic steel-teeming technology based on electromagnetic induction heating was proposed. To assess the proposed technology, an experimental platform that imitates the actual production condition of steelmakers was established. High temperature experiments were perfor...
The influence of high magnetic field annealing on the morphology, microstructure, and properties of pulsed-electrodeposited Co-Ni-P films was investigated. The as-deposited film with a rough surface changed into uniform nanocrystalline during the magnetic field annealing process. In particular, the formation of intestine-like appearance with spheri...
Ultrafine crystalline functionally graded cemented carbides (FGCCs) with a surface zone enriched in binder phase were prepared by a one-step Sinter-HIP method. The influence of sintering pressure and cubic carbide composition on the formation of gradient layer was examined. The results show that the ultrafine FGCC with surface zone enriched in bind...
Sinter-HIP combining vacuum and pressure in one-step sintering process has been applied to prepare ultrafine crystalline cemented carbide with a surface gradient layer enriched in binder. The effect of powder particle size on gradient formation and grain growth has been examined. The results show that the gradient layer thickness increases with dec...
The effects of silicide formation on the surface structure and magnetic properties of Co thin films on Si (100) were investigated. Annealing temperature significantly changed the formation of silicide. CoSi phase was formed during annealing at 600°C and 700 °C. CoSi2 phase was formed during annealing at 800 °C. The anisotropy of Co/Si (100) films c...
Nanocrystalline Fe30Ni70 (in atomic %) thin films were prepared by molecular-beam-vapor deposition in magnetic fields with different magnetic flux densities. The microstructure evolution of these thin films was studied by atomic force microscopy, transmission electron microscopy, and high resolution transmission electron microscopy; the soft magnet...
In this study we have explored how a high magnetic field (HMF) affects the structure and magnetic properties of Fe thin films fabricated on Si (100) substrates at various substrate temperatures by using a thermal evaporation method. At a substrate temperature of room temperature (RT), the HMF increased the width of column and the formation energy o...
Structural evolutions of Co561 clusters supported on the Cu(010) substrate were studied by molecular dynamics simulation using an embedded atom method. Energy, snapshot, pair distribution function and epitaxial factor were used to analyze the effects of supported position, configuration and temperature on the structural evolutions. It is found that...
The formation of bcc and fcc during the coalescence of free and supported Fe and Ni clusters has been studied by molecular dynamics simulation using an embedded atom method. Structural evolution of the clusters, coalesced under varying temperature, Ni content and substrate conditions, was explored by interatomic energy, snapshot, pair distribution...
This paper studies the effects of Ag atomic segregation from the inner (100) or (111) planes on the melting of Ag–Pd clusters with different sizes by a molecular dynamics simulation. The results show that Ag segregation leads to the atomic energy decreases with increasing the temperature. Furthermore, the effect of the (100) segregation is larger t...
- [...]
Several samples of Zn-Sb alloys, composed with β-Zn4Sb3 and Zn phases, were prepared by solidification under high magnetic fields (HMFs). The microstructure evolution and thermoelectric (TE) properties of the alloys were then investigated. Zn phase precipitated as strip and presented reticulation structure in the samples without HMFs. When the HMFs...
The nanocrystalline Fe64Ni36 thin films were prepared by molecular-beam-vapor deposition under different magnetic flux densities. The microstructure and magnetic properties of thin films were examined by AFM, TEM, HRTEM and VSM. The results show that with the increase of magnetic flux densities, the changing trend of the average particle size is th...
In the preceding work, the inclusion behavior in a submerged entry nozzle (SEN) and mold induced by using a swirl flow has been investigated. The results showed that a swirl flow can effectively promote the inclusions removal to the meniscus as well as reduce the inclusions entrapment at the solidified shell wall. Moreover, that the swirl flow was...
The Fe60Ni40 (in atomic %) nanoparticles (NPs) thin films with 90 nm thickness were prepared on 25 and 400 °C quartz substrates by using the molecular beam vapor deposition (MBVD) method under a 6 T high magnetic field (HMF). The effects of a HMF on the structure evolution and properties of Fe–Ni thin films were studied by using X-ray diffraction,...
An Mn-Sb alloy was isothermally annealed in a semisolid state without and with a high magnetic field. The effect of the high magnetic field on the evolution of the crystal orientation of ferromagnetic Mn-Sb particles during their coarsening process was investigated. The effect of the high magnetic field on the magnetic property of the treated alloy...
The effect of a high magnetic field on phase formation and determination in Ni–Fe film at nanoscale is reported. The bcc structure of the film changed to the coexistence of bcc and fcc phases by increasing the substrate temperature from 25 to 200 to 400 °C without magnetic field. Under a 6 T magnetic field, a coexistence of bcc and fcc phases was f...
In this work, the placement of an electromagnetic swirl flow generator (EMSFG) around a submerged entry nozzle (SEN) was proposed as a method for generating a rotating electromagnetic field in a continuous casting (CC) process of steel. First, two kinds of a full type EMSFG and a half type EMSFG were designed based on mathematical modeling. Then, d...
We report on the influence of magnetic field strength on the alloy Tb0.27Dy0.73Fe1.95 during slow-cooling solidification. We examined the effect of magnetic field strength on microstructure, magnetization, and magnetostrictive properties of this giant magnetostrictive alloy. We found that after field-treated solidification, the microstructure of sp...
The recent contributions on changes induced by high magnetic fields in transport phenomena, such as convection, solute diffusion, solute or phase migration in the liquid, are reviewed and analyzed. Selectivity provided by the Lorentz, thermoelectromagnetic (a special kind of Lorentz force), and magnetic forces or combinations enables the control of...
To guide the application of a new automated steel-teeming system which in continuous casting is controlled by electromagnetic induction technology, the parameters of the induction coil and system reliability need to be analyzed. The teeming time of an industrial ladle (1.5 t) with the new system was investigated using experimental and numerical met...
This paper studies the effects of a high magnetic field on the structural evolution and magnetic properties of nanocrystalline Ni films prepared on quartz substrates by a molecular beam vapor deposition (MBVD) method. Atomic force microscope, X-ray diffractometer, transmission electron microscope and vibrating sample magnetometer were used to study...
Carbide precipitation and eutectic phase transformation during solidification of Fe–C–Cr–Ti–Mn–Mo–Ni–Si Ti–added high-chromium cast irons (HCCIs) were studied numerically and experimentally by the help of Partial Equilibrium approximation, DSC thermal analyses and EDX analyses. The main carbides formed during the solidification are distinguished as...
A TbFe2 based alloy was treated in the semi-solid state under high magnetic fields of 0 T, 4.4 T, 8.8 T and 11.5 T. The effects of high magnetic fields on crystal orientation, magnetization and magnetostriction of the alloys were investigated. We found that with an increase in the magnetic flux density from 0 T to 11.5 T the orientation of the TbFe...
Study on the behaviors of the melting and coalescence of clusters in atomic scale may create new structure at nanoscale, which is a very important research field. The structural evolutions of clusters Cu321, Co 321, and Ni321 during their melting and coalescence processes were studied using molecular dynamics simulation with a general embedded atom...
A three-dimensional heat transfer mathematic model and elastic-plastic constitutive equation are developed. Based on ProCAST commercial software, MiLE algorithm coupled with user program is used to simulate solidification and thermal stress in the Incoloy 800 superalloy continuous casting process. The effects of some necessary operating parameters...
Metallic nano-multilayers have been paid more attention for their nanostructure and high strength. We have fabricated several kinds of multilayers by Accumulative Roll-Bonding (ARB), with average layer thickness between 20 and 100 nm. The multilayers were either made of two immiscible elements, or by two elements that can generate intermetallic com...
In this study, a new method for swirling flow generation in submerged entry nozzle (SEN) in continuous casting of steel process has been proposed. A rotating electromagnetic field is set up around the SEN to induce swirling flow in it by the Lorentz force. And this kind of electromagnetic swirling flow in the SEN is proposed to use in square billet...
The influence of static magnetic field of 4 T on electroless Ni-P deposition process and post-annealing was investigated in this study. The results from differential scanning calorimeter have shown that the imposed high magnetic field during electroless deposition had a further beneficial effect on defects migration and annihilation after Ni-P allo...
Isothermal heat treatment experiments of an Al–4.8mass%Cu alloy were carried out under different magnetic field intensities, at different temperatures and for different holding times. The influence of high magnetic fields on area fraction of θ phase in the solidified microstructure was investigated. It was found that the area fraction of the θ phas...
Due to its excellent creep rupture strength and low cost, superalloy GH2984 has becoming a promising material to be used as heat exchanger in the prospective 700 °C fossil power plant. The mechanical response of the material under various forming conditions, which is a particularly important indicator for the superalloy, strongly depends on the for...
Nanocrystalline soft magnetic films with high saturation magnetization MS
and low coercivity HC
are needed to meet the application demands. This paper studies the effects of in-situ high magnetic field application on 80 nm thick Ni45
Fe55 film prepared by molecular beam vapor deposition. The results show that a 6 T magnetic field can significantly...
Nanocrystalline FexNi1−x (in at%, x=0.74, 0.6, 0.55, and 0.3) thin films were prepared on a 25 °C quartz substrate by using a molecular beam vapor deposition method with and without a 6 T magnetic field. The microstructure of the thin films was characterized by energy dispersive x-ray spectroscopy, x-ray diffractometry and transmission electron mic...
The effects of high magnetic field and post-annealing on the structural, electrical and magnetic properties of the evaporated Ni films were investigated and compared. The in-situ application of a 6 T magnetic field during evaporation or post-annealing at 200 °C did not change the crystal structures of the films. However, the magnetic field makes th...
The microstructure evolution and magnetization and magnetostriction properties of Tb0.3Dy0.7Fe1.95 alloy solidified in a high magnetic field were investigated. A cellular microstructure was produced, with the grains highly aligned along the direction of the magnetic field. The (Tb,Dy)Fe2 phase was highly oriented, with its 〈1 1 1〉 axis along the ma...
A three-dimensional heat transfer mathematic model and elastic-plastic constitutive equation are developed. Based on ProCAST commercial software, MiLE algorithm coupled with user program is used to simulate solidification and thermal stress in the Incoloy 800 superalloy continuous casting process. The effects of some necessary operating parameters...
Metallic nano-multilayers have been paid more attention for their nanostructure and high strength. We have fabricated several kinds of multilayers by Accumulative Roll-Bonding (ARB), with average layer thickness between 20 and 100 nm. The multilayers were either made of two immiscible elements, or by two elements that can generate intermetallic com...
Inconel 625 is a Ni-Cr-Mo-Nb alloy which was developed primarily for high turbine applications. The elemental addition of Nb increases the solidification temperature range, which exhibits a strong propensity to form interdendritic segregation. The enrichment of elements Nb and Mo at the terminal stage of solidification leads to the formation of bri...
In this paper, the effect of an annealing treatment on the microstructure, mechanical properties and electrical conductivity of a deformed Cu-12.8 wt%Fe composite prepared by the "casting/cold working" process is investigated. The Fe filaments exhibit the shape characteristic in the as-drawn composite as the annealing temperature is lower than 500...
The formations of nanoclusters with different geometries are strongly related to the nucleation. This is of importance in controlling the structures of nanoclusters. In this letter, the freezing processes of (CoCu)309 clusters were studied by using molecular dynamics simulation with an embedded atom method. It is found that the frozen structures we...
In order to weaken the bias flow in the submerged entry nozzle (SEN) with slidegate, the rotating magnetic field was imposed. The numerical method was employed to investigate the effect of rotating magnetic field on the flow field in the SEN and the mold under different slide-gate opening ratios. Numerical results showed that when the slide-gate op...
We investigated the effect of a high magnetic field on the magnetostriction of TbFe2-based alloy during a semi-solid state process. With the application of a high magnetic field, magnetostrictions under free and compressive prestress conditions remarkably increased. Obvious magnetically anisotropic behavior of the TbFe2-based alloy was observed. A...
Co/Ni bilayered films were prepared on ITO glass by electrodeposition assisted with a magnetic field up to 0.5T aligned parallel to the electrode surface. The effect of a high magnetic field annealing up to 12T on morphology and microstructure of the post-deposited films was investigated by field emission scanning electronic microscopy (FE-SEM), X-...
This paper studies the melting of Ag–Pd bimetallic clusters with different Ag concentrations and atomic distributions by using molecular dynamics simulation with a general embedded-atom method. The melting of a cluster with 45 % Ag atoms distributing in the core was compared with that of 45 %, 15 % Ag on the surface and 15 % Ag in the core. It is f...
This paper studies the influence of Ag atomic segregation on the structural evolutions of the mixed (PdAg)309clusters during the heating processes by using molecular dynamics with a general embedded atom method. The results show that the Ag atomic segregation makes the cluster exhibit a segregate-melting stage in which the energy does not monotonic...
Steel flow control in a continuous slab caster mold is effective for preventing entrapments of both mold power and argon gas bubbles and maintaining high slab quality. The steel flow control technology that utilizes a traveling magnetic field to optimize the flow of steel in the mold has been developed and applied. The moving magnetic fields can in...
The solidification path and precipitation of carbides in the Fe-C-V-Cr-Mo-W high speed steel system are predicted with the help of thermodynamic equilibrium calculations. The Partial Equilibrium (PE) approximation is favoured. According to experimental data for high speed steel samples, the precipitating solidification sequence of carbides, includi...
A coupled Cellular Automaton - Finite Volume (CA-FV) model is developed
for the prediction of macrosegregation and solidification microstructure
of an Al-Si binary alloy under unidirectional solidification. The
enthalpy, concentration and velocities are calculated at FV scale
following macroscopic fluid flow, heat and solute transfer equations.
The...
The size, number, morphology and type of inclusion particles are the key factors to estimate the quality of steel product. Although considerable efforts have been made in the mathematical modeling of inclusion growth, few papers were involved in inclusion's nucleation and collision-growth, and all the existing researches about the behaviors of magn...
A multiphase microsegregation model for the solidification of
multicomponent alloys that experience a peritectic transformation is
developed. It is based on a volume averaging method. Coupling is
achieved among the conservation equations for total mass, solute mass
and energy. The diffusion in extradendritic and several interdendritic
liquid and so...
Effects of a static high magnetic field of 4T on the electroless Ni-P deposition with sodium citrate and lactic acid as a complexing agent, respectively, are studied in this work. The results show that the magnetic field accelerates nickel deposition using sodium citrate as a complexing agent. On the contrary, the deposition process is retarded in...
The solidification experiment of Cu-25%Ag alloy used in high field magnet was carried out under HMF (high magnetic field), then the ingots were cold drawn into wires. The solidified structure, drawn structure and electrical conductivity were investigated systematically. In the case of no HMF, it is found that the columnar Cu dendrites is longer, mo...
This paper studies the freezing of Co clusters with diameters ranging from 2.52 to 4.62 nm by using molecular dynamics simulation with an embedded atom method. It was found that the frozen structures are closely related to cluster sizes. When the cluster size is small (≤ 2.94 nm), an icosahedron is formed. When the cluster size is large (≥ 3.79 nm)...
This Letter studies the size-dependent freezing of Co, Co–Ni, and Co–Cu clusters by using molecular dynamics with embedded atom method. Size effect occurs in these three types of clusters. The clusters with large sizes always freeze to form their bulk-like structures. However, the frozen structures for small sizes are generally related to their com...
The effects of an 11.5 T high magnetic field on the growth behavior of compounds layers during reactive diffusion in solid
Al/solid Mg diffusion couples have been investigated. After annealing with and without a magnetic field, the interfacial zone
was still composed of two layers of stable compounds β (Mg2Al3) and γ (Mg17Al12), but the thicknesses...
In this work, Mn–Sb alloys were melted and held in various magnetic field gradients for various times. The corresponding distributions of the alloying elements in the alloys in liquid state were revealed by a quenching method. It was found that the primary MnSb showed a relatively uniform distribution in the alloy quenched in the magnetic field gra...
Al-12Si-11.8Mg-6.5Ti alloy samples were solidified in high magnetic fields with various magnetic field gradients. The effects
of high magnetic fields on the distribution and alignment of primary phases in the alloys were investigated. It was found
that the uniform magnetic field could improve the homogeneity of the primary Mg2Si, whereas the magnet...
The kinetics of the reactive diffusion at the liquid Al/solid Cu interface was investigated at T = 973 K, 1023 K, and 1073 K in a high magnetic field of 11.5 T. During the annealing process, three stable compounds (δ, ξ2, and η2) layers were formed at the interface of the couples, and a power function relationship between the mean thickness of the...
Compared to the conventional cathode structure electrolytic cell, the new type of cathode structure electrolytic cell can effectively inhibit the fluctuation of liquid aluminum, which can reduce the polar distance, decrease cell voltage, and save energy. A cold water model was designed according to scale of 1:3 with 160KA industrial electrolytic ce...
The effects of an 11.5T magnetic field on phase equilibria of Mn–Sb system during solidification process were investigated with the aid of direct thermocouple measurements and quantitative metallography analysis. It was found that the magnetic field could increase the eutectic line and the area fraction of the MnSb in eutectics, and thus shift the...
The size segregation of sintering materials in a chute flow is utilized to prepare well-bedded feedstock for sintering quality improving, and magnets are installed below the chute to enhance size segregation. By the braking role of magnetic force, the particles of different sizes which poured down to sloping chute are separated:the coarse particles...
The effect of high magnetic fields on the nucleation behavior of Ni-90at%Cu alloys and pure Sb were investigated. It was found that the undercooling of both Ni-90at%Cu alloys and pure Sb before nucleation was increased by the application of a high magnetic field of 11.5T. An obvious grain refinement was observed in the Ni-90at%Cu alloys solidified...
The effect of electromagnetic stirring on the inner quality and solidification microstructure of the GH 3030 superalloy ingots was investigated by casting experiments. As we know from the experiments, the solidification microstructure of GH3030 is the single-phase of austenite. With the electromagnetic stirring (EMS) the grains of the GH3030 ingots...
Compared to the conventional cathode structure electrolytic cell, the new type of cathode structure electrolytic cell can effectively inhibit the fluctuation of liquid aluminum, which can reduce the polar distance, decrease cell voltage, and save energy. A cold water model was designed according to scale of 1:3 with 160KA industrial electrolytic ce...
Recently, the studies on the effects of high magnetic fields on solidification processes have been paid much attention both from the fundamental and applied points of view. With the aid of the enhanced Lorentz force and magnetization effect caused by the remarkably increased magnetic field intensity, several interesting phenomena, such as the contr...
In order to develop a new method for in situ fabricating multilayer functionally graded materials (FGMs), high magnetic field gradients are proposed to control the solidification behaviors of peritectic alloys. Solidification experiments of Bi-11.8wt%Mn alloys under various magnetic field gradient conditions have been conducted and the macro- and m...
A microsegregation model for the solidification of multicomponent alloys is developed. It couples the volume-averaged conservation equations for total mass, solute mass and energy assuming a uniform temperature. The diffusion in the liquid and solid phases, the growth kinetics of the solidifying microstructures and the velocity of the solid/liquid...
The solidification microstructure evolution and the Columnar to Equiaxed Transition (CET) during Al-Si and Al-Cu binary alloy solidification processes are analyzed by the help of Cellular Automaton-Finite Difference (CA-FD) model The effects of the physical properties except the effects of the nucleation parameters and the operation parameters on t...
A new method (electromagnetic steel-teeming method) using electromagnetic induction heating in slide gate system was proposed to overcome the pollution of traditional nozzle sand on the molten steel and achieve 100% automatic steel teeming. By Joule heat, this new process is to melt part or the whole of a new ladle well-packing materials (i.e. Fe–C...
The solidification experiment of Cu-25%Ag alloy used in high field magnet was carried out under high magnetic field, the precipitation of Ag in Cu-rich dendrites, the hardness and the electrical conductivity were investigated. It was found that the Ag phase precipitated exhibites continuous rod-like morphology in the larger Cu-rich dendrites, and e...
The study of residue time distribution (RTD) curve is usually one of the effective methods to estimate the flow characteristics in the continuous casting tundish. In the past, the analysis model for RTD curve of one-strand is usually applied to estimate the individual strand data in multi- strand tundish, but the result obtained by such a model can...
The distribution of alloying elements and the corresponding structural evolution of Mn–Sb alloys in magnetic field gradients were investigated in detail. It was found that a high magnetic field gradient could control the distribution of solute element in the alloys during the solidification process and therefore resulted in the coexistence of both...
With the imposition of a high magnetic field up to 11.5T, the morphologic transition of the MnBi phase and the magnetic properties of the Bi–4.36wt.% and 8.25wt.% Mn alloy specimens solidified from a semi-solid state were investigated. Compared with the irregular shape and unequal dimensions of MnBi grains under 0T, the coarsened MnBi grains were c...
A mechanical analysis is done to find the evolution of the interface profile between binary immiscible fluids induced by a
three-dimensional orthogonal magnetic field gradient. In the experiments, the changes of the interface profile between four
groups of binary immiscible fluids are investigated under the same horizontal magnetic field gradients....
The shift of the Kirkendall marker at the interface of Cu-Ni diffusion couples was examined under the influence of high magnetic fields up to 12 T. The shift distance of the marker increased remarkably with increasing magnetic flux density (B) in the case of the direction of diffusion parallel to B. However, if the direction of the magnetic field w...
Swirling flow in an immersion nozzle generated with a swirl blade in it has been proved to be effective to reduce the meniscus fluctuation and homogenize the distribution of temperature in a mold during continuous casting of steel. However, this process has insuperable limitations: the swirling flow intensity can not be regulated to meet the proces...
The Cu-80%Pb(mass fraction) hypermonotectic alloy with a dense distribution of Cu- rich particles was annealed at different temperatures under high magnetic field, the transition behavior of Cu-rich particles in solid-liquid mixture zone was investigated. The results show that, the transition behavior of Cu-rich particles occurs above 800°C, a comp...
The melting process of Co, Co–Cu and Co–Ni clusters with different initial configurations is studied in molecular dynamics by a general embedded atom method. An irregular melting, at which energy decreases as the temperature increase near the melting point, is found in the onion-like Co–Cu–Co clusters, but not in the mixed Co–Cu and onion-like Co–N...
Molecular dynamics simulation with the embedded atom method was applied to study the melting and coalescence in the mixed
Cu–Ni nanoclusters. The validity of the model was tested by examining the consistency of the phase diagrams of the (Cu682-mNim)682 and (Cu1048-mNim)1048 clusters with the Cu–Ni bulk. The coalescences of two mixed Cu–Ni clusters...
An induced coil surrounding a segmented mold used in soft-contact electromagnetic casting (soft-contact EMC) was used to produce a high frequency magnetic field for reducing ferrostatic pressure between the mold and melt. The distribution of magnetic field in the mold was examined using a magnetic probe of the induction coil type. Then mathematical...
The effect of a magnetic force on creating an aligned two-phase microstructure in a Fe-0.25wt%C alloy under magnetic field gradients has been investigated. Through the changes in the heating temperature, both dipolar interactions and magnetic forces work together during the austenite to ferrite transformation. The results showed that the aligned tw...
The dendrite tip growth kinetics in the flow field and the decentred quadrilateral growth algorithm for describing the evolution of grain growth are combined in Cellular Automaton model to predict the deflective growth of dendrites inclined toward upstream direction. The influences of flow intensity, cooling rate (or solidification rate), nucleatio...
A Cellular Automaton (CA) -Finite Difference (FD) coupling model was developed to analyze the evolution of solidification microstructure and the columnar-to-equiaxed transition (CET) in Al–Si alloy. Kobayashi's microsegregation equation was adopted to describe the solute diffusion in solid phase, and a “decentred square” growth algorithm with coord...
The effects of uniform and gradient magnetic fields on gravity segregation in AI-5wt%Cu and AI-10wt%Mg alloys are investigated. The results show that high magnetic fields can be used to control the solute distribution and thus control gravity segregation caused by the difference of physical properties such as density and magnetic susceptibility bet...
The effects of high magnetic fields on the morphology change of primary Sb phase in a Mn-95.2 wt.%Sb hypereutectic alloy have been investigated. The Mn-95.2 wt.%Sb alloy specimens were solidified under various magnetic field conditions. Thermal analysis was carried out to characterize the nucleation temperature, i.e., the undercooling of primary Sb...
This study is concerned with the investigation of the structural evolution occurring during isothermal annealing of an Mn-89.7 wt%Sb alloy in a high magnetic field in the semisolid state. The alloy specimens were isothermally annealed without and with an 11.5-T magnetic field for various annealing times. With the application of the magnetic field,...
Mn–89.7wt.%Sb alloy specimens were solidified in various magnetic fields with different holding times. The influence of the high magnetic field on the orientation of both the primary and eutectic MnSb crystals and on the alignment of the primary MnSb grains in the alloys has been investigated. It was found that the primary MnSb crystals were orient...
The dependence of icosahedral transformations on the composition, concentration and configuration in Cu-based bimetallic clusters was studied by using molecular dynamics with the embedded atom method. The results show that the transformation is strongly related to the release of excess energy and can be controlled by tuning the composition, concent...
In the steel industry, the continuous casting product is usually a pre-produt before being fed to hot rolling mill, which brings in high cost and pollution and low productivity. So a new technology is demanded urgently to produce surface defect free billets and slabs. The success of electromagnetic casting (EMC) technology utilized in aluminum cast...
Citations
... The diameter and the transmission frequency of the UDV was 12 mm and 2 MHz, respectively, and the resolution was 2250 ns. Such kinds of measurement methods were well used by us [29,30]. To simulate experiments of the slab continuous casting process of steel under the composite magnetic field, we used 350 kg of molten alloy, as shown in Figure 10a. ...
... Metallurgists [4][5][6] have done lots of work to reduce the pollution generated by nozzle sand to liquid steel and to improve the free opening rate, but they have not thoroughly avoided the use of nozzle sand. The Electromagnetic Induction Controlled Automated Steel-Teeming (EICAST) technology completely solves the drawbacks caused by the use of nozzle sand in traditional steel-teeming technology [7][8][9][10][11]. In this new technology, the nozzle sand is replaced by Fe-C alloy particles, whose composition is similar or the same as the liquid steel, and an induction coil located in nozzle brick is used to melt part or all of the sintered Fe-C alloy. ...
... When the atoms diffused along the liquid phase distributes between the hard phases, it is necessary to bypass the large-sized WC grains, leading to increasing of the atomic diffusion stroke and decreasing of the atomic diffusion efficiency. 11 Therefore, when the cemented carbides have large size WC grain or even exist abnormal WC grain growth, only relatively thinner gradient layer can be obtained. When the ball milling time reached 45 hours, the WC grains grew more obviously and there was more abnormal WC grain growth. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/434894313660417-1480698292526_Q64/Kai-Wang-109.jpg)
... The peak Co content was lowest in the FGCM without any carbide addition and the location of the peak was also farthest from the surface ( Figure 18). A one-step sintering-HIP process using Ti(C,N) as the gradient former was used in [158] for fabricating functionally graded cemented carbides (FGCC). With increasing sintering pressure and decreasing (Ta, Nb)C content, the gradient layer thickness increased. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272291246374927-1441930700843_Q64/Guojian-Li.jpg)
... However, relatively little study has reported on the influence of EMS on flow field in the mold under slide gate system. Geng et al. 24) investigated the effect of rotating magnetic field on the flow field in the SEN and the billet mold under different slide-gate opening rates, and showed that the EMS current can improve the bias flow in the mold, but the electromagnetic stirrer was equipped around the SEN but not the mold, furthermore, most of research did not consider the solidified shell in their work, in addition, some other process parameters, such as the casting speed and SEN depth, are also lack of consideration. ...
... The larger grain size mainly indicated a quality improvement in crystalline Fe (ref. 19), which was also believed to be the reason for the decreased surface roughness of the trilayer. Meanwhile, the intensities of these two peaks were compared with each other, and a raised ratio of I Fe{110} /I Fe{200} was found with the increasing magnitude of the magnetic field ( Fig. 1b). ...
... Such a structure leads to the formation of active sites with identical adsorption and catalytic characteristics, which makes it possible to obtain target products with extremely high selectivity. Thus, several authors reported on the preparation of efficient SAA Pd-based catalysts for the selective hydrogenation of styrene, Inorganics 2023, 11, 150 2 of 13 butadiene and acetylene, as well as in the dehydrogenation of acetic acid [15][16][17][18][19][20][21]. Despite the high selectivity of SAA catalysts toward the desired products, their activity is usually limited owing to the small number of isolated Pd sites on the surface of PdM nanoparticles. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/420634430590977-1477298471659_Q64/Chun-Wu-8.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/11431281116345726-1675238398160_Q64/Xudong-Sui-2.jpg)
... coating [18] , solar thermal energy conversion [19] . Creating magnetic anisotropy in thermally stable Ni films, such as Co/Ni [20] , Fe/Ni [21] , Ni/NiO [22] , Ni [23] , has been widely studied due to the promising application in magnetic recording media or spintronics [ 24 , 25 ]. This anisotropy highly depends on film thickness, annealing process and buffer layer [26] . ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/999993573920769-1615428455653_Q64/Yongze-Cao.jpg)
... That is to say, the coalesced clusters with larger Ni NPs form an FCC structure. Structural transformation was induced by NPs containing greater numbers of atoms 29 . Au atoms are induced by Ni atoms lattice, and the cross section of Au atoms can also illustrate this point. ...
... The mass content is 30% of Pb, 20% of Sn, and 50% of Bi. The physical properties of molten Pb-Sn-Bi alloys are similar to those of molten steel [28]. It is feasible to simulate molten steel flow under an electromagnetic field using this alloy. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/279598332956672-1443672845134_Q64/Engang-Wang.jpg)
